unreconstructed

Merriam-Webster definition

Not reconciled to political, economic, or social change; also : holding stubbornly to a particular belief, view, place, or style.

“The reorganization and reestablishment of the seceded states in the Union after the American Civil War is referred to as the Reconstruction. The earliest known use of unreconstructed is by a writer for the Boston, Massachusetts, publication The Liberator, who in 1865 used it to describe Southerners who were not reconciled to the outcome of the War and the changes enacted during the Reconstruction. The word immediately caught on and has been used to refer to intransigent or dyed-in-the-wool partisans ever since. The word is also used outside of political and social contexts, as when a person is described as “an unreconstructed rocker” or “an unreconstructed romantic.”